Identification of Risk Factors Associated with Axillary Lymph Node Metastasis for Sentinel Lymph Node-Positive Breast Cancer Patients

Figure 2

The proportion of patients with the indicated numbers of risk factors exhibiting N2 disease (risk factors include LVI, 2 positive SLNs, SLN metastasis ratio ≥50%, and HER2 overexpression). ALN, axillary lymph node; LVI, lymphovascular invasion; SLN, sentinel lymph node; HER2, human epidermal growth factor receptor 2.